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Ceiling Register Box-C Box (Square)
Our premium HVAC Duct Ceiling Boxes or C-Box, are used to attach a register in the ceiling to supply air in any room. Our C-Boxes are manufactured from the high quality galvanized steel. Sizes listed are the box opening widths, then the round size as the last dimension. They have a plaster ground flange attached for easy finishing to your plaster or drywall.